Which statement best distinguishes sterilization, disinfection, and antisepsis?

• A. Disinfection kills all microorganisms on any surface.
• B. Antisepsis destroys all microorganisms on living tissue.
• C. Sterilization kills all microorganisms; disinfection reduces pathogens on inanimate surfaces; antisepsis reduces pathogens on living tissue.
• D. Sterilization and disinfection are identical processes.

Answer: (C)

Understanding how these terms differ comes down to scope and the level of microbial elimination. Sterilization is the process that makes an object completely free of all forms of life, including resistant spores; it’s the highest level of microbial control and is used for inanimate objects. Disinfection reduces the number of viable microorganisms on inanimate surfaces, but it does not guarantee total elimination, nor does it necessarily kill spores. Antisepsis applies to living tissue, aiming to lower the microbial burden to prevent infection, but it does not achieve sterility.

The option that states all three distinctions—sterilization kills all microorganisms; disinfection reduces pathogens on inanimate surfaces; antisepsis reduces pathogens on living tissue—captures these differences clearly. It’s not correct to say disinfection kills all microorganisms or that antisepsis eliminates everything on living tissue, and sterilization and disinfection are not identical processes.